And instead of just shrugging it off, you could tag strangers that annoy you and end up with a giant list of grudges against a whole host of people. The false positives (e.g. twins and doppelgangers) should make it interesting.
Take it to the next step towards Black Mirror where the AR shadows out people you've blocked and then mutes their voice so you can't hear them
That would make for fantastic comedic situations when you then physically bump into them after you erased them from your AR vision xD.
Which feeds into Saint Motel's song "You're Nobody Til Somebody Wants You Dead" which has a bit about how the list just grows and grows until it's everyone you've ever known...